the antennas are the standard small screw fitting ones that the AP was delivered with, the service sometimes disconnects and resets then connects again (to all PCs) performance gets better the closer the PC is to the AP but disconnect and reset still occurs

The single "rubber duckie" antennas are ok for short distances, there are more powerful ones available. Do you have one or two antennas attached to the AP?

Where are the AP mounted? you want to mount them as high as possible.

Is the building constructed of brick, cement, or wood interior walls?

When the users get dropped, do they all get dropped at the same time?

Is the AP rebooting when they get disconnected?

Do you have an microwave generating devices in the area (cell phone tower, microwave oven, etc)?

With out knowing more about how the AP are installed, and the environment they are installed in, it will be very hard to find the root cause. I'm either suspecting poor signal strength (the weaker the signal the slower the connection will be), or something in the environment (power issues, or something external causing the AP to reboot). Inside a wood frame building you should have about 125m of coverage. If you are in a cement or brick building, with cement or brick interior walls you may get 50m of coverage as long as the signal doesn't have to go through too many walls. In a big room like a meeting hall you should get almost 300m of coverage as long as there are no walls between the computer and antenna.

Your AP shouldn't be having such poor performance, and George seems to be assisting you with that issue as I am not familiar with the product and can't get my mind in gear this morning.

However, Wireless performance will deteriorate at some point when you have high traffic loads and a large number of users, the reason for this is all wireless clients are on the same broadcast segment. Unlike modern switched wired environments where collision is likely never happen wireless works much more like a hub used to. All clients see all traffic. Therefore more clients and more data = more collisions = degraded network performance. In addition to this you have other issues with wireless like interference from other devices that emit radio waves etc....

As Alex pointed out all WiFi is basically shared media so you will have issue with heavy load with basically type of device. The way is was explained to be is think of basic WiFi as a 10 port hub in your room. Get one client on that is taking alot of bandwidth and *poof* everybody is dog slow. Now with larger area mesh controllers and several access points is addresses many of those issues, but still it is shared - not switched - media...

15m with brick wall at 10m 90% signal quality and another pc at 5m no walls, ap power is UPS-ed and surge protected, single standard antennae supplied. Encryption enabled nominal up-time 2-3hrs on a good day.

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